225921018 has 16 divisors (see below), whose sum is σ = 452006496. Its totient is φ = 75279600.

The previous prime is 225920987. The next prime is 225921023. The reversal of 225921018 is 810129522.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17868 + ... + 27768.

It is an arithmetic number, because the mean of its divisors is an integer number (28250406).

Almost surely, 2^225921018 is an apocalyptic number.

225921018 is an abundant number, since it is smaller than the sum of its proper divisors (226085478).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

225921018 is a wasteful number, since it uses less digits than its factorization.

225921018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13709.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 225921018 is about 15030.6692465771. The cubic root of 225921018 is about 609.0489686439.

The spelling of 225921018 in words is "two hundred twenty-five million, nine hundred twenty-one thousand, eighteen".